The Aspin–Welch test can be used to test the hypothesis that two means, from independent samples, are equal without making the assumption of equal variances. The article presents the formulas for the test statistic and for two critical values, cites the literature for another critical value, identifies problems in the test, cites literature for solutions to these problems, and cites literature for extensions to the Aspin–Welch test for comparing means in multiple independent samples in one-way and multi-way layouts, and for comparing mean vectors in multivariate designs.